Elevator



(No Model'.) 2 Sheets-Sheet 2.

P. WRIGHT.

ELEVATOR- No. 477,730. Patented June 28 1892.

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me TATES PATENT OFFICE.

.PARVIN WRIGHT, OF DENVER, COLORADO.

ELEVATOR.

SPECIFICATION forming part of Letters Patent No. 77,730, dated June 28,1892. Application filed May 18, 1891- Serial No. 393.152- (No model.)

To all whom it may concern.-

Be it known that I, PARVIN lVRIGI-IT, a citi zen of the United States,residing at Denver, in the county of Arapahoe and State of 0010- rado,have made a new and useful invention in Elevators, of which thefollowing is a specification.

My invention is directed particularly to the adaptation of electricmotors for use in con-.

neotion with elevators, and also to certain features lookm g to theoperation of safety devices for preventingaccidentsdue to abnormalspeeds of the elevator-car, and it will be fully understood by referringto the accompanying drawings, taken in connection with thespecification, but particularly pointed out in the claims which followsaid specification.

Figure 1 of the drawings represents a side elevation of an elevatorembodying my improvements. Fig. 2 represents a longitudinal sectionalview of the same, and Fig. 8 is an enlarged detail view of a part of thesafety apparatus.

Prior to my invention it was old in the art to manipulate elevator-carsby electric motors located either at the base of the elevator-shaft orcarried by the elevator-car. It was also old to devise means forautomatically checking the descent or ascent of the car when it attaineda speed beyond that of safety.

My invention is directed to features of novelty hereinafter described,but particularly pointed out in the claims at the end of thisspecification.

Referring now to the drawings in detail, T T represent the side timbersof the elevatorshaft, and E the elevator-car, supported in the usual wayby a cross-bar V, having guideways 'at its opposite ends adapted tosustain it in vertical alignment.

The hoisting-cable F passes over transmission pulleys or sheaves P P,and has attached to its opposite end a counter-weight 1V adapted to movein guideways in the side timber T. The pulley or sheave P is carried bythe same shaft which supports a gearwheel G, meshing with a worm W, saidworm being connected in the manner shown to the armature-shaft of anelectric motor M. The gear-wheel G and worm W are inclosed in a housing13, having a removable cover C, said housing being separable from asimilar housing 13" on the lower side of the shaft, and both of saidhousings being attached to a base or support B carried by thecross-timbers A A, the parts being bolted together, as clearly shown inFig. 1,'and all rendered substantially dust-tightwhen the mechanism isall in position.

at is a removable screw-plug in the lower portion of the housing 13,adapted to be removed so as to withdraw the refuse oil from the journalsand worm-gear as it seeps down into the lower housing.

H is a brake-lever pivotally secured to the cross-timbers A at one endand lying beneath and in the plane of the grooved pulley or sheave P,but normally out of contact therewith, its free end being supported bythe short arm of a weighted lever K and having its free end sustained bythe hooked portion of a bell-crank lever N, pivoted to the cross timbersA, the free end of said bell-cranlele ver being located in alignmentwith a sliding shaft operatively connected with a pair of ball-governorsG, carrying a pulley P On the outer or free end of the lever K 1s anadjustable weight M, on the top of WhlCll rests the free end of agripping-lever 0, provided with a serrated jaw J, adapted to grip andfirmly hold a rope R, which passes around the governing-pulley P theguide-pulleys P and P and a weighted pulley P ad ustably secured nearthe bottom of the elevator-shaft, the opposite ends of the rope R beingfixedly secured to the bottom of the elevator-car E by pins m near themiddle of a gripping-lever L, which is connected by a pivoted rod Q to asimilar gripping-lever L at the opposite side of the car, these twogripping-levers being provided with serrated jaws J J, adapted, whenactuated, to firmly grip the face of the timber T.

L represents a fixed block bolted or otherwise secured to the base ofthe elevator-car, there being one of these blocks on each side of thecar opposite the gripping-levers L L.

t represents a wooden pin, which temporarily unites the pivotedlever Lwith the base of the car, there being a similar wooden pin in the leverL on the opposite side of the car.

to w represent the conductor running from an extraneous source ofelectrical energy (not shown) to the binding-posts of the motor M, the

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conductor 20' passing first through the switch S, pivoted atone end tothe timber A and restin g at its free end between the contact-springs c6, said lever being in the path of the free end of the weighted lever K,so that when said lever is released by its governor it will actuate theswitch and break the circuit.

Having thus described the operative parts of my invention, I now proceedto describe its mode of operation. Suppose the elevator to be ascendingand through some accident the car E to have obtained an abnormal speedunder this condition of affairs, the rope R will cause thegoverning-pulleys G to force the vertical shaft downward, therebyreleasing the lever K from the hooked end of the lever N. This permitsthe weight M to turn the lever K about its fulcrum d and force the brakeH into the groove of the pulley P, thus bringing the car instantly to astop. The same action causes the circuit to be broken at switch S, andhence the motor to be stopped. Should the car be descending and anabnormal speed be obtained, either by the breaking of the cable F orotherwise, the brake II will be in like manner put into operation, andshould it fail to instantly stop the car in its descent the applicationof the brake-lever O to the rope R will instantly check said rope in itsdescent with the car, thus causing it to break the wooden pins t in thepivoted levers L L, thereby allowing the lower serrated faces J of theselevers to firmly grip and hold the car against the counteracting effectof the blocks L upon the timbers T T. Continued abnormal speed in theupward direction ofthe car, should the brake H fail to check it, wouldin like manner cause the brake-levers L L to bring into action the upperserrated jaws J J.

Having thus described my invention, what I claim, and desire to secureby Letters Patent of the United States, is-

1. Au elevator having an electric motor located at the top of the shaft,a speed-governor geared to the car, and a switch connected in circuitwith the motor and lying in the path of a weighted lever operativelyconnected with a brake, and a speed-governor whereby the car may beautomatically checked when runnin g at abnormal speed, substantially asdescribed.

2. A safety device for an elevator, consisting of a governor operativelyconnected with the car, a brake held normally out of action by a detentoperatively controlled by the governor, and a second brake carried bythe car and connected to a rope or cord which drives the governor,substantially as described.

3. A safety device for an elevator, consisting of a gripping devicecarried by the car and held normally out of action by a fragile pin, incombinationwith a governor connected by a rope to the gripping-lever,and a second gripping-lever for gripping the rope, substantially asdescribed.

PARVIN W'RIGHT.

Witnesses:

AMos GREEN, GEORGE GIRARD.

